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Rex::Encoders::XorDword::Backend

Public Instance Methods

_prepend() click to toggle source
# File lib/rex/encoders/xor_dword.rb, line 15
def _prepend
        # set the counter to the rounded up number of dwords to decode
        Rex::Arch::X86.set(
                Rex::Arch::X86::ECX,
                (encoded.length - 1 >> 2) + 1,
                badchars
        ) +
        "\xe8\xff\xff\xff" +                # call $+4
        "\xff\xc0" +                        # inc eax
        "\x5e" +                            # pop esi
        "\x81\x76\x0e" + key +              # xor_xor: xor [esi + 0x0e], $xorkey
        "\x83\xee\xfc" +                    # sub esi, -4
        "\xe2\xf4"                          # loop xor_xor
end

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